This page explains how Kelvin Koh (USATT# 90486)'s rating went from 2009 to 2013 at the NJTTC Thursday Adv League event from 14 Sep 2017. The links below take you to pages that describe various aspects of the rating processor.

The rating processor goes through 4 passes in order. The links take you to pages that provide detailed explanations of the calculations during each of the 4 passes.